E4OD Peoblems! Need help

Austinfee

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For starters,
1990 f250 7.3 Idi 4x4
E4od with sterling 10.25 (4:10 gears)

The short story is, I had to replace my rear axle because the hub retainer nut broke and stripped my spindle threads (at this point my rear and transmission are in great working order).
I found a new axle housing and began swapping my 4:10 gears that were in my original axle. Only thing I replaced was bearings, crush washer, & pinion nut.
My first test drive, first to second gear was a hard shift. Second gear to forth gear acted as if they were one continuous gear ( rpms stayed at 2k with no drop in rpm between gears) and over drive worked if it wanted to.
The truck sat for 3 months before the first test drive. No flashing OD light & no check engine light.

Less than a year ago I changed
-vehicle speed sensor and wiring
-pencil gear and drive gear for speedometer
-speedometer cable
-fluid and filter
-rear speed sensor and wiring
-neutral safety switch

I am stumped as to why this transmission is acting up considering It worked so well before it was parked

Let me know what you guys think, thanks
 

icanfixall

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May want to check the throttle position switch voltage on the center wire at the switch. The tps switch is located on the drivers side of the injection pump. It MUST register between .96 to 1.2 volts on a warmed up engine key on engine off idle position.
 

trackspeeder

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You could try scanning for codes. 1990 is the early TCM so it might have a stored code. With the early TCM you can't count on the OD off light flashing.

Skipping third gear could be multiple issues. Faulty TPS, faulty VSS, faulty TRS or faulty tach sensor. Take a look at the ABS sensor too. Seeing how the tranny was working fine before the axle work.
 

Austinfee

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Ok, I checked the TPS voltage

First I started off by just making sure it was getting 5v. Than I checked the return voltage ( should be about 1v ). It was 3.8v at idle and the voltage dropped as I “gave it fuel”

Going to start by replacing the TPS

Have you ever heard of this happening?
 

Thewespaul

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That’s very common. Ford actually had a recall of the early fipls because they were so failure prone.
 

trackspeeder

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Ok, I checked the TPS voltage

First I started off by just making sure it was getting 5v. Than I checked the return voltage ( should be about 1v ). It was 3.8v at idle and the voltage dropped as I “gave it fuel”

Going to start by replacing the TPS

Have you ever heard of this happening?


This is common. Most last about 50k miles. Some don't make it out of the box.:eek:
 
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